Whether Cambridge's residential zoning classification, as applied to Nectow's particular parcel, violated the Fourteenth Amendment's Due Process Clause.
Holding
Yes. The residential classification was unconstitutional as applied because it had no substantial relation to the public health, safety, morals, or general welfare and seriously injured Nectow's property interests.
Reasoning
The Court accepted that Cambridge's zoning ordinance, viewed in its general scope, was constitutional under Euclid. But a zoning measure that is valid on its face may still be unconstitutional when applied to a particular property. The city's power to restrict land use is not unlimited: a restriction must bear a substantial relation to public health, safety, morals, or the general welfare.
The factual findings showed that the parcel's surroundings made it poorly suited to the limited residential uses the ordinance allowed. Industrial and unrestricted land lay immediately south and east, including the Ford plant, while the parcel itself was of comparatively little value for residential development. The master found that no practical residential use could be made of the land because such development would not provide an adequate return on investment.
The confirmed finding that residential zoning would not promote health, safety, convenience, or general welfare was decisive. That finding was supported by the character of the surrounding area and by the parcel's diminished usefulness under the restriction. Since the public-purpose justification necessary to sustain this serious invasion of property rights was absent, the classification was arbitrary as applied and fell within the Fourteenth Amendment's prohibition.